Optional. The page size for search result pagination. Page
size is capped at 500 even if a larger value is given. If set
to zero, server will pick an appropriate default. Returned
results may be fewer than requested. When this happens, there
could be more results as long as next_page_token is
Optional. A comma separated list of fields specifying the
sorting order of the results. The default order is ascending.
Add " desc" after the field name to indicate descending order.
Redundant space characters are ignored. For example, " foo ,
bar desc ".